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EP2148322B2 - Convertisseur d'ultrasons - Google Patents
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EP2148322B2 - Convertisseur d'ultrasons - Google Patents

Convertisseur d'ultrasons Download PDF

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Publication number
EP2148322B2
EP2148322B2 EP09008962.4A EP09008962A EP2148322B2 EP 2148322 B2 EP2148322 B2 EP 2148322B2 EP 09008962 A EP09008962 A EP 09008962A EP 2148322 B2 EP2148322 B2 EP 2148322B2
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EP
European Patent Office
Prior art keywords
housing
region
ultrasonic
waves
resonators
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09008962.4A
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German (de)
English (en)
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EP2148322A2 (fr
EP2148322B1 (fr
EP2148322A3 (fr
Inventor
Jereon Martin van Klooster
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Krohne AG
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Krohne AG
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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • G10K9/22—Mountings; Casings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/662—Constructional details
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices

Definitions

  • the invention relates to an ultrasonic transducer with a housing, an ultrasonic window provided in a first region of the housing for transmitting ultrasonic waves between the interior of the ultrasonic transducer and the exterior of the ultrasonic transducer and a transducer element arranged in the housing adjacent to the ultrasonic window, wherein ultrasonic waves can be transmitted as housing waves between the first region of the housing via at least one intermediate second region of the housing and a third region of the housing opposite the first region of the housing.
  • Ultrasonic transducers of the aforementioned type have been known for many years and are used extensively in acoustic flow meters, for example.
  • the transducer element of the ultrasonic transducer converts electrical energy into a mechanical deflection, and with suitable excitation also into an oscillation in the ultrasonic range.
  • the ultrasonic transducer works as an ultrasonic transmitter and the ultrasonic waves are - partially - transmitted via the ultrasonic window into the medium surrounding the ultrasonic transducer.
  • the ultrasonic window is deflected by external pressure fluctuations occurring in the medium and the deflection is converted into a corresponding signal by the transducer element; in this case, the ultrasonic transducer works as an ultrasonic receiver.
  • an ultrasonic transducer is used both as an ultrasonic transmitter and as an ultrasonic receiver; in the field of flow measurement, an ultrasonic transducer is often used either as an ultrasonic transmitter or as an ultrasonic receiver.
  • the ultrasonic waves transmitted through the ultrasonic window that reach the transducer element or originate from the transducer element are the actual useful signal of interest.
  • the ultrasonic waves described at the beginning that are passed on or diverted via the housing are parasitic housing waves. The energy transmitted with these waves is not available for the useful signal, so housing waves are generally undesirable.
  • Some measures are concerned with the task of preventing such housing waves from occurring. These include, for example, certain designs of the ultrasound window with regard to particularly good impedance matching to maximize the transmitted energy share or with regard to designing the ultrasound window as a ⁇ /4 layer to reduce reflections. Other measures are concerned with preventing housing waves that have already occurred from being transmitted, for example by means of mismatched acoustic impedance transitions. However, housing waves do not only represent a loss of power for the useful signal, they can also have other adverse effects.
  • acoustic flow measurement usually makes use of the effect that in a medium transported in a measuring tube, the speed of propagation of the sound signal is superimposed on the transport speed of the medium.
  • the measured speed of propagation of the sound signal relative to the measuring tube is therefore greater than in a stationary medium if the medium is transported in the direction of the sound signal, and the speed of the sound signal relative to the measuring tube is lower than in a stationary medium if the medium is transported in the opposite direction to the emission direction of the sound signal.
  • the travel time of the sound signal between the sound transmitter and the sound receiver - both are ultrasonic transducers - depends on the transport speed of the medium relative to the measuring tube and thus relative to the sound transmitter and the sound receiver due to the entrainment effect.
  • the object of the present invention is therefore to provide an ultrasonic transducer which implements a further measure for preventing the transmission of housing waves via the housing of the ultrasonic transducer and avoids - at least partially - the disadvantages known from the prior art.
  • the ultrasonic transducer according to the invention in which the previously derived and indicated object is achieved, is characterized first and foremost by the features of the characterizing part of patent claim 1.
  • a further development according to the invention provides that at least two weakly coupled mechanical resonators are formed in the second region of the housing, which are arranged essentially one behind the other in the direction of propagation of the housing waves.
  • the inventive design of the ultrasonic transducer or the second area of the housing of the ultrasonic transducer brings with it various advantages.
  • the mechanical resonators make it possible to "catch" the energy transported by the ultrasonic waves locally, namely by exciting the mechanical resonators to oscillate.
  • Mechanical resonators can usually be described as spring-mass systems, whereby in real spring-mass systems the property of the spring - namely a deflection-dependent force effect - cannot be realized without making a contribution - albeit a very small one - to the mass of the resonator, just as a mass always influences the spring property of the spring-mass system due to its structural introduction into the resonator; spring and mass are actually not completely separable from one another in terms of construction.
  • the housing waves have to pass through all the resonators in order to get from the first area of the housing to the third area of the housing and vice versa.
  • the weak coupling of the two resonators means that the resonators represent a greater obstacle to the housing waves than is the case with strongly coupled resonators, even if they otherwise have the same vibration properties.
  • strong mechanical coupling the vibration of one resonator is transferred almost immediately to the neighboring resonator, which is not the case with weak mechanical coupling, although there is of course a mechanical interaction between the neighboring resonators.
  • the natural frequencies of the resonators are in the frequency range of the housing waves, which ensures that as much of the energy of the housing waves as possible is bound in the vibration of the resonators due to the resonance effect of oscillating systems.
  • housing waves can be suppressed in a wide frequency range, which is particularly important when emitting or receiving broadband ultrasonic signals.
  • the weakly coupled mechanical resonators provided in the second area of the housing thus act practically as a band stop filter (or several band stop filters) in the transmission path from the first area of the ultrasonic transducer to the third area of the ultrasonic transducer.
  • the first region of the housing and/or the third region of the housing is designed such that the resonance frequency of the first region of the housing and/or the third region of the housing - within structurally acceptable limits - is as far away as possible from the natural frequencies of the weakly coupled resonators in the second region of the housing and is thus as far away as possible from the operating frequency of the ultrasonic transducer.
  • Ultrasonic transducers are often designed in the form of a sleeve in an axial direction of extension in the second region of the housing, with the ultrasonic window in the first region of the housing closing off this sleeve as an end face towards the medium.
  • the sleeve-shaped second region of the housing is then usually cylindrical.
  • the third region of the housing which is opposite the first region of the housing, can consist, for example, of a flange-like connecting piece or also only in the open end region of the sleeve.
  • the housing waves are transmitted via the housing as a whole, also in the axial direction of extension.
  • at least one resonator is designed as a hollow ring or as a step, with an upper flat wall, with a lower flat wall and with an end wall connecting the upper flat wall and the lower flat wall.
  • a resonator as a hollow ring or as a step is advantageous because both structures can be manufactured very easily and with great precision, for example by machining in one piece from solid material.
  • the hollow rings are aligned essentially in the axial direction of extension of the second region of the housing, with the second region of the housing then having wall cross-sections that run in a meandering manner in the axial direction of extension in the region of the hollow rings.
  • the stiffness of the end wall of the hollow ring or the step is greater in the axial extension direction than the stiffness of the first flat wall and/or the stiffness of the second flat wall. This measure ensures that oscillation of the resonators in the axial direction of extension is very easy and can be easily excited. If the resonators - as previously explained - are understood as a spring-mass system, then the end wall is the component of the resonator that contributes the majority of the mass, and the first flat wall and/or the second flat wall essentially implement the spring properties of the spring-mass system.
  • the stiffness of the end wall - seen in the axial direction of extension - is at least one order of magnitude or even more than two orders of magnitude greater than the stiffness of the first flat wall and/or the stiffness of the second flat wall.
  • the above-described and indicated object is achieved in the ultrasonic transducer described at the outset in that the second region of the housing is designed in the form of a sleeve in an axial direction of extension and at least one mechanical resonator is formed in the second region of the housing in such a way that there is no direct connection between the first region and the third region of the housing to which the resonator is attached, so that the housing waves have to pass through the resonator, the resonator being designed as a hollow ring or as a step, with an upper flat wall, with a lower flat wall and with an end wall connecting the upper flat wall and the lower flat wall, and that the natural frequencies of the at least one resonator are in the frequency range of the housing waves.
  • the applicant is aware of ultrasonic transducers in practice that have a mechanical resonator in the second, mediating region of the housing, but these are far more complicated in construction and correspondingly more difficult to manufacture.
  • the design of the resonator as a hollow ring or as a step is, however, very simple to manufacture and therefore inexpensive to implement, whereby the spring-mass parameters - resonance frequency, damping and thus quality - of this oscillating system are very easy to adjust.
  • the parameters are preferably adjusted by a suitable choice of the thickness of the flat walls - spring constant - and the thickness of the end wall - mass. All preferred designs of the weakly coupled resonators are, if transferable, also preferred designs of the single resonator.
  • FIG. 1 to 7 Each of the figures shows an ultrasonic transducer 1 with a housing 2 and an ultrasonic window 4 provided in a first region 3 of the housing 2 for transmitting ultrasonic waves between the interior of the ultrasonic transducer 1 and the exterior of the ultrasonic transducer 1; the ultrasonic waves are not shown as such.
  • All of the ultrasonic transducers 1 shown also have a transducer element 5 arranged in the housing 2 adjacent to the ultrasonic window 4, which in the cases shown is a piezo crystal.
  • the figures are to be described as schematic in that they only show the elements necessary for understanding the present invention; for example, the electrical wiring required to excite the transducer element 5 and to read out electrical signals from the transducer element 5 has been completely omitted.
  • the exact structure of the first area 3 of the housing 2 and the design of the ultrasonic window 4 are also not discussed in detail; both can have a very complicated structure, but this is not of fundamental importance in the present case. It is also not important in the present case whether the housing 2 of the ultrasonic transducer 1 in the first area 3 is designed as a single piece or in multiple pieces; various variants are conceivable and different designs are known from the prior art.
  • the primary aim of the ultrasonic transducer 1 shown is to transmit the ultrasonic waves generated by the transducer element 5 from the interior of the housing 2 via the ultrasonic windows 4 into the exterior of the ultrasonic transducer 1. It is of great interest to transmit as large a proportion as possible of the energy used to excite the transducer element 5 in the form of ultrasonic waves into the exterior of the housing 2, since this means that the actual useful signal is at its greatest and a good signal-to-noise ratio is achieved.
  • the ultrasonic waves are transmitted and can be transmitted as housing waves G between the first area 3 of the housing 2 via an intermediate second area 6 of the housing 2 and a third area 7 of the housing 2 opposite the first area 3 of the housing 2.
  • These housing waves G not only reduce the power available for the actual useful signal of interest, but they can also crosstalk to other components of the measuring setup (not shown in detail here), be transmitted further and superimpose the directly transmitted useful ultrasonic waves elsewhere, which makes evaluation of the useful ultrasonic waves more difficult.
  • the third area 7 of the housing 2 is designed as a flange in all illustrated embodiments.
  • the possible transmission directions of the housing waves G are indicated, whereby the double arrows make it clear that the housing waves G not only radiate from the first region 3 of the housing 2, but can also be coupled into the third region 7 of the housing 2 and can propagate via the intermediate second region 6 of the housing 2 to the first region 3 of the housing 2.
  • the ultrasonic transducers 1 shown are characterized in that two weakly coupled mechanical resonators 8, 9 are formed in the second region 6 of the housing 2, which are arranged one behind the other in the direction of propagation of the housing waves G.
  • the mechanical resonators 8, 9 are formed in the housing 2 because this forces the housing waves G to run over and through the resonators 8, 9 in order to get from the first region 3 of the housing 2 to the third region 7 of the housing 2 and vice versa.
  • the housing waves G reach the mechanical resonators 8, 9, their energy is - at least partially - accumulated in the resonators 8, 9, since the mechanical resonators 8, 9 are excited to oscillate.
  • the behavior of the resonators 8, 9 is particularly advantageous in applications in which the ultrasonic transducer 1 or the transducer element 5 is periodically excited in pulses, in particular at intervals at which the resonator oscillations have decayed again.
  • the ultrasonic transducers 1 shown have mechanical resonators 8, 9 whose natural frequencies lie in the frequency range of the housing waves G. This makes it possible to selectively intercept frequency components of the housing waves G or to attenuate their transmission from the first region 3 of the housing 2 to the third region 7 of the housing 2 and vice versa.
  • the second, mediating area 6 of the housing 2 is designed in a sleeve-like manner in an axial extension direction A, wherein the housing waves G in the housing 2 of the ultrasonic transducer 1 also essentially spread out in the extension direction A.
  • the two resonators 8, 9 shown are designed as a hollow ring, with each resonator 8, 9 having an upper flat wall 10, a lower flat wall 11 and an end wall 12 connecting the upper flat wall 10 and the lower flat wall 11.
  • the end wall 12 connects the upper flat wall 10 and the lower flat wall 11 all the way around, so that the housings 2 of the ultrasonic transducers 1 shown are sealed overall when the housings 2 are closed in the third area 7 of the housing with a suitable connection (not shown here).
  • an ultrasonic transducer 1 which has a resonator 8 designed as a step and a resonator 9 designed as a hollow ring.
  • the upper flat wall 10 and the lower flat wall 11 - seen in the axial extension direction - cause an increase in diameter or a reduction in diameter of the sleeve-shaped housing.
  • the resonator 9 designed as a hollow ring the upper flat wall 10 and the lower flat wall 11 face each other in the axial extension direction A.
  • the resonators 8, 9 designed as hollow rings have in common that they are essentially aligned in the axial direction of extension A of the second region 6 of the housing 2, if it is assumed that the surface normal characterizing the orientation of the hollow rings is perpendicular to the plane in which each hollow ring lies flat. This surface normal is shown in the embodiments coincide with - coaxial with - the center line marked in the figures as the axial extension direction A.
  • the second area of the housing 2 has meandering wall cross-sections in the area of the hollow rings in the axial extension direction A.
  • the housing waves G could more or less "graze along” resonators designed in this way.
  • the housing waves G must practically pass through the mechanical resonators 8, 9.
  • the ultrasonic transducers 1 in the exemplary embodiments are designed such that in the axial extension direction A the rigidity of the front wall 12 is greater than the rigidity of the upper flat wall 10 and the rigidity of the lower flat wall 11.
  • the rigidities of these elements of the resonators 8, 9 differ by a factor of approximately 300, namely the rigidity of the front wall 12 is greater by a factor of approximately 300 than the rigidity of the upper flat wall 10 and the rigidity of the lower flat wall 11 of each resonator 8, 9.
  • a suitable dimensioning of the upper flat wall 10 and the lower flat wall 11 in relation to the connecting end wall 12 is very easy to achieve by using the second order area moments of inertia of the base bodies to calculate the stiffness of these elements with respect to the axial extension direction A.
  • this is a circular disk clamped on the circumference and in the case of the connecting end wall 12, for simplicity, a beam.
  • FIG. 2a and 2b an ultrasonic transducer 1 with two resonators 8, 9 is shown, whereby the resonators 8, 9 are in the oscillating state.
  • the resonators 8, 9 are excited in the first oscillation mode - the upper flat wall 10 and the lower flat wall 11 oscillate in the same direction -, whereas the resonators 8, 9 in Fig. 2b are excited in the second vibration mode, i.e. the upper flat wall 10 and the lower flat wall 11 move in opposite directions to each other.
  • the ultrasonic transducers 1 according to the Fig. 6 and 7 have damped resonators 8, 9.
  • O-rings are provided as damper elements 13 in the outer region of the housing 2 of the ultrasonic transducer 1, whereby these are not arranged between the resonators 8, 9, but rather between a resonator 8, 9 and an adjacent housing part of the resonators 8, 9. This avoids an increase in the coupling between the resonators 8, 9 while at the same time effectively damping the respective resonator oscillations.
  • the damper element 13 is formed by a casting compound that fills the resonators 8, 9 or the hollow space of the resonators 8, 9 designed as a hollow ring. This damper element 13 also does not increase the coupling between the resonators 8, 9. Viscoelastic material is suitable as a damper element 13 if it can be ensured that it cannot be displaced from the resonators 8, 9 or the spaces between the resonators. Essentially elastic material is used for the O-rings, namely an elastomer.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Measuring Volume Flow (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Claims (6)

  1. Convertisseur à ultrasons comportant un boîtier (2), une fenêtre à ultrasons (4) prévue dans une première zone (3) du boîtier (2) et destinée à transmettre des ondes ultrasonores entre l'espace intérieur du convertisseur à ultrasons et l'espace extérieur du convertisseur à ultrasons et un élément convertisseur (5) disposé dans le boîtier (2) à proximité de la fenêtre à ultrasons (4), des ondes ultrasonores pouvant être transmises en tant qu'ondes de boîtier (G) entre la première zone (3) du boîtier (2), par l'intermédiaire d'au moins une deuxième zone (6) intermédiaire du boîtier (2), et une troisième zone (7) du boîtier (2) opposée à la première zone (3) du boîtier (2),
    caractérisé en ce que
    la deuxième zone (6) du boîtier (2) est conçue à la façon d'un manchon s'étendant dans une direction d'extension axiale (A) et en ce qu'au moins un résonateur mécanique (8, 9) est réalisé dans la deuxième zone (6) du boîtier (2), de manière à ce que, entre la première zone (3) et la troisième zone (7) du boîtier (2), il n'y ait aucune liaison directe à laquelle le résonateur (8, 9) est attaché de sorte que les ondes de boîtier (G) doivent passer par le résonateur (8, 9),
    le résonateur (8, 9) étant réalisé sous la forme d'un anneau creux ou sous la forme d'un gradin pourvu d'une paroi supérieure plane (10), d'une paroi inférieure plane (11) et d'une paroi frontale (12) reliant entre elles la paroi supérieure plane (10) et la paroi inférieure plane (11), et à ce que les fréquences propres de l'au moins un résonateur (8, 9) soient situées dans le domaine fréquentiel des ondes de boîtier (G).
  2. Convertisseur à ultrasons selon la revendication 1, caractérisé en ce qu'au moins deux résonateurs mécaniques (8, 9) faiblement couplés sont réalisés dans la deuxième zone (6) du boîtier (2), lesquels résonateurs sont disposés sensiblement l'un derrière l'autre dans la direction de propagation des ondes de boîtier (G).
  3. Convertisseur à ultrasons selon la revendication 1 ou 2, caractérisé en ce que l'anneau creux est sensiblement orienté dans la direction d'extension axiale (A) de la deuxième zone (6) du boîtier (2), et plus particulièrement, la deuxième zone (6) du boîtier (2) présentant, dans la région de l'anneau creux, des sections transversales de paroi s'étendant de manière sinueuse dans la direction d'extension axiale (A).
  4. Convertisseur à ultrasons selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la rigidité de la paroi frontale (12) dans la direction d'extension axiale (A) est supérieure à la rigidité de la paroi supérieure plane (10) et/ou à la rigidité de la paroi inférieure plane (11), et est notamment supérieure d'au moins un ordre de grandeur, et de préférence, d'au moins deux ordres de grandeur.
  5. Convertisseur à ultrasons selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'au moins un résonateur (8, 9) est amorti, notamment par au moins un élément amortisseur (13) disposé dans un résonateur (8, 9) et/ou entre deux résonateurs (8, 9) ou au voisinage d'un résonateur (8, 9).
  6. Convertisseur à ultrasons selon la revendication 5, caractérisé en ce que l'élément amortisseur (13) est un joint torique ou une masse coulée, notamment en matière élastique ou viscoélastique.
EP09008962.4A 2008-07-15 2009-07-09 Convertisseur d'ultrasons Active EP2148322B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008033098.1A DE102008033098C5 (de) 2008-07-15 2008-07-15 Ultraschallwandler

Publications (4)

Publication Number Publication Date
EP2148322A2 EP2148322A2 (fr) 2010-01-27
EP2148322A3 EP2148322A3 (fr) 2014-05-14
EP2148322B1 EP2148322B1 (fr) 2017-03-01
EP2148322B2 true EP2148322B2 (fr) 2024-12-11

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ID=41401890

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Application Number Title Priority Date Filing Date
EP09008962.4A Active EP2148322B2 (fr) 2008-07-15 2009-07-09 Convertisseur d'ultrasons

Country Status (6)

Country Link
US (1) US7973453B2 (fr)
EP (1) EP2148322B2 (fr)
JP (1) JP5355268B2 (fr)
CN (1) CN101676693B (fr)
CA (1) CA2672058C (fr)
DE (1) DE102008033098C5 (fr)

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DE102010064117A1 (de) 2010-12-23 2012-06-28 Endress + Hauser Flowtec Ag Ultraschallwandler
CN102879044A (zh) * 2011-07-15 2013-01-16 上海一诺仪表有限公司 超声波换能器壳体结构
EP2758753B1 (fr) * 2011-09-23 2016-02-24 Kamstrup A/S Débitmètre doté de transducteurs saillants
DE102011090082A1 (de) 2011-12-29 2013-07-04 Endress + Hauser Flowtec Ag Ultraschallwandler für ein Durchflussmessgerät
DE102013020497B4 (de) 2013-01-28 2018-10-11 Krohne Ag Baueinheit aus einem Ultraschallwandler und einen Wandlerhalter
EP2762842B1 (fr) * 2013-01-28 2024-02-14 Krohne AG Transducteur d'ultrasons pour un debitmetre a ultrasons
DE102013211606A1 (de) * 2013-06-20 2014-12-24 Robert Bosch Gmbh Umfeldsensiereinrichtung mit Ultraschallwandler, und Kraftfahrzeug mit einer derartigen Umfeldsensiereinrichtung
EP4091725B1 (fr) 2014-07-11 2024-09-04 Microtech Medical Technologies Ltd. Transducteur à cellules multiples
DE102014115589A1 (de) 2014-10-27 2016-04-28 Endress + Hauser Flowtec Ag Anordnung zum Aussenden und/oder Empfangen eines Ultraschall-Nutzsignals und Ultraschall-Durchflussmessgerät
DE102014115592A1 (de) 2014-10-27 2016-04-28 Endress + Hauser Flowtec Ag Anordnung zum Aussenden und/oder Empfangen eines Ultraschall-Nutzsignals und Ultraschall-Durchflussmessgerät
DE102015103486A1 (de) * 2015-03-10 2016-09-15 Endress + Hauser Flowtec Ag Anordnung und Feldgerät der Prozessmesstechnik
DE102015106352A1 (de) 2015-04-24 2016-10-27 Endress + Hauser Flowtec Ag Anordnung und Ultraschall-Durchflussmessgerät
EP3178570B1 (fr) * 2015-12-07 2019-01-30 Danfoss A/S Transducteur ultrasonore et procédé de fabrication associé
EP3273210B1 (fr) 2016-07-18 2022-05-18 VEGA Grieshaber KG Détecteur de niveau à lames vibrantes et son procede de fabrication
DE102017214370A1 (de) * 2017-08-17 2019-02-21 Landis + Gyr Gmbh Schallkopf für einen Durchflussmesser mit gestufter Seitenwand
DE102018213853A1 (de) * 2018-08-17 2020-02-20 Zf Friedrichshafen Ag System zum Messen eines Füllstands
CN110801297B (zh) * 2019-12-05 2025-02-14 深圳市凡超科技有限公司 超声波换能结构及手持式洁牙器
US11976951B2 (en) 2020-09-25 2024-05-07 Krohne Messtechnik Gmbh Ultrasonic transducer including separately-excitable electro-acoustic discs, ultrasonic flowmeter including the ultrasonic transducer, and related methods for operating the ultrasonic transducer and ultrasonic flowmeter
EP4170296B1 (fr) 2021-10-22 2023-10-11 Krohne AG Convertisseur ultrasonique et débitmètre ultrasonique
DE102022114985B3 (de) * 2022-06-14 2023-10-05 Krohne Ag Ultraschalldurchflussmessgerät

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CN101676693B (zh) 2012-10-03
DE102008033098C5 (de) 2016-02-18
EP2148322A2 (fr) 2010-01-27
US20100011866A1 (en) 2010-01-21
CA2672058A1 (fr) 2010-01-15
EP2148322B1 (fr) 2017-03-01
DE102008033098A1 (de) 2010-01-21
CA2672058C (fr) 2015-09-29
CN101676693A (zh) 2010-03-24
DE102008033098B4 (de) 2010-07-01
EP2148322A3 (fr) 2014-05-14
JP5355268B2 (ja) 2013-11-27
US7973453B2 (en) 2011-07-05
JP2010028815A (ja) 2010-02-04

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